public static Bitmap CaptureDesktop()
{
Bitmap bmp = null;
{
var hDc = IntPtr.Zero;
try
{
SIZE size;
hDc = Win32.GetDC(Win32.GetDesktopWindow());
var hMemDc = Gdi.CreateCompatibleDC(hDc);
size.Cx = Win32.GetSystemMetrics
(Win32.SmCxscreen);
size.Cy = Win32.GetSystemMetrics
(Win32.SmCyscreen);
var hBitmap = Gdi.CreateCompatibleBitmap(hDc, size.Cx, size.Cy);
if (hBitmap != IntPtr.Zero)
{
var hOld = Gdi.SelectObject
(hMemDc, hBitmap);
Gdi.BitBlt(hMemDc, 0, 0, size.Cx, size.Cy, hDc,
0, 0, Gdi.Srccopy);
Gdi.SelectObject(hMemDc, hOld);
Gdi.DeleteDC(hMemDc);
bmp = Image.FromHbitmap(hBitmap);
Gdi.DeleteObject(hBitmap);
// GC.Collect();
}
}
finally
{
if (hDc != IntPtr.Zero)
{
Win32.ReleaseDC(Win32.GetDesktopWindow(), hDc);
}
}
}
return(bmp);
}
private void Init()
{
_windowDC = User.GetWindowDC(_windowHandle); // hdcSys
_compatDC = Gdi.CreateCompatibleDC(_windowDC); // hdcMem
BITMAPINFO bi = new BITMAPINFO();
bi.bmiHeader.Init();
bi.bmiHeader.biWidth = _rc.Width;
bi.bmiHeader.biHeight = -_rc.Height;
bi.bmiHeader.biPlanes = 1;
bi.bmiHeader.biBitCount = 32;
_bitmap = Gdi.CreateDIBSection(_windowDC, ref bi, DIBColors.DIB_RGB_COLORS, out _bitmapPixels, IntPtr.Zero, 0);
IntPtr hOldBmp = Gdi.SelectObject(_compatDC, _bitmap);
Gdi.DeleteObject(hOldBmp);
_mat = new Image <Bgra, byte>(_rc.Width, _rc.Height, 0, _bitmapPixels);
}
